Ive got 2, neither of them are to huge crowds like the others mentioned before but to me these moments were just incredible.
The 1st one was playing at The Charlotte before it went bust, it was in my old pop punk band and we opened up with eye of the tiger and because I was going out with the owners neice he turned out all the lights so when my drum sticks lit up when I played it made the intro look amazing really proffesional.
The 2nd was hearing the crowd sing along to a song I wrote, it was a ballad which I normally step down from the drums and join in having a sing song but on this occasion I could hold the mic to the crowd and feel like a god, I still cant explain how amazing that felt, it nearly brought a tear to my eye